[INFO] fetching crate rust_black_tree 0.1.5...
[INFO] checking rust_black_tree-0.1.5 against master#3dbade652ed8ebac70f903e01f51cd92c4e4302c for pr-69741
[INFO] extracting crate rust_black_tree 0.1.5 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate rust_black_tree 0.1.5 on toolchain 3dbade652ed8ebac70f903e01f51cd92c4e4302c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate rust_black_tree 0.1.5
[INFO] finished tweaking crates.io crate rust_black_tree 0.1.5
[INFO] tweaked toml for crates.io crate rust_black_tree 0.1.5 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate rust_black_tree 0.1.5 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5f6f585b9b51b085e0a719fcaf444cec425d250ca6b105d8737a8ec2e44895c7
[INFO] running `"docker" "start" "-a" "5f6f585b9b51b085e0a719fcaf444cec425d250ca6b105d8737a8ec2e44895c7"`
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking regex-syntax v0.6.15
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]     Checking nix v0.14.1
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking rayon-core v1.7.0
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]     Checking criterion-plot v0.4.1
[INFO] [stderr]     Checking regex-automata v0.1.8
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]     Checking bstr v0.2.11
[INFO] [stderr]     Checking regex v1.3.4
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]     Checking rustyline v6.0.0
[INFO] [stderr]     Checking rust_black_tree v0.1.5 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking criterion v0.3.1
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]  --> benches/my_benchmark.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::iter;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Throughput`
[INFO] [stderr]  --> benches/my_benchmark.rs:3:74
[INFO] [stderr]   |
[INFO] [stderr] 3 | use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
[INFO] [stderr]   |                                                                          ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 41.06s
[INFO] running `"docker" "inspect" "5f6f585b9b51b085e0a719fcaf444cec425d250ca6b105d8737a8ec2e44895c7"`
[INFO] running `"docker" "rm" "-f" "5f6f585b9b51b085e0a719fcaf444cec425d250ca6b105d8737a8ec2e44895c7"`
[INFO] [stdout] 5f6f585b9b51b085e0a719fcaf444cec425d250ca6b105d8737a8ec2e44895c7